extrapolate[ VectorOfValues ]

[floswald]

I was wondering whether you could support evaluating an extrapolation object at a vector, rather than only at a point (or how I would do that):

julia> x = [3z for z in linspace(0.0,1,10)]
julia> itp = interpolate((1:10,),x,Gridded(Linear()) 
julia> extp = extrapolate(itp,Linear()))
julia> itp[linspace(0.0,1.0,20)]
20-element Array{Float64,1}:
 -0.333333 
 -0.315789 
 -0.298246 
 -0.280702 
 -0.263158 
 -0.245614 
 -0.22807  
 -0.210526 
 -0.192982 
 -0.175439 
 -0.157895 
 -0.140351 
 -0.122807 
 -0.105263 
 -0.0877193
 -0.0701754
 -0.0526316
 -0.0350877
 -0.0175439
  0.0      

julia> extp[linspace(0.0,1.0,20)]
ERROR: MethodError: no method matching isless(::LinSpace{Float64}, ::Int64)

julia> extp[-1]
-0.6666666666666666